Why can't I add user defined materials for use in specifying ANSI/ASME flanges?

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For ASME/ANSI B16.5 and B16.47 flanges, COMPRESS permits using only those materials that are actually listed in these standards. This restriction applies to long weld neck flanges (LWN) and other "integral" forgings where the standard flange is forged integrally with the nozzle neck.

Materials for ASME/ANSI B16.5 and B16.47 flanges are contained in a database that is separate from the ASME Section II materials database. The flange database contains only those materials listed in Tables 1A of the flange standards. Materials cannot be added to or removed from this database.

If a different material is approved by Code Case or Interpretation for use under B16.5 or B16.47, select a listed material from the same material group that the proposed material would fall into. In this manner, the correct pressure-temperature rating would be applied in the COMPRESS model.